#!/bin/sh
#
# callin
#
# All Rights Reserved. Copyright (C)2008 Xelatec, L.L.C.
# http://www.xelatec.com
# Author: Steven Henke sph@xelatec.com
#
#SPECPORT=32022
SPECPORT=9901
MIDDLEMAN=callin@callin.xelatec.com
#
# wget -N http://www.xelatec.com/pub/callin
# chmod 700 callin
echo -
echo - Xelatec Support Call In Utility
echo -
echo -n "Enter your Call In ID:"
read callinid
#
wget -N http://www.xelatec.com/pub/id_rsa_callin_$callinid
chmod 600 id_rsa_callin_$callinid
wget -N http://www.xelatec.com/pub/id_rsa_callin.pub
wget -N http://www.xelatec.com/pub/id_rsa.pub
# 
sed -i "s/AllowTcpForwarding no/AllowTcpForwarding yes/g" /etc/ssh/sshd_config
sed -i "s/#AllowTcpForwarding yes/AllowTcpForwarding yes/g" /etc/ssh/sshd_config
#
/etc/init.d/sshd restart
#
if ! [ -d /root/.ssh ]; then
    mkdir /root/.ssh
fi
#
echo - 
echo - Opening access tunnel for remote service.
#echo - Use Ctrl-C to close the tunnel.
echo - Visit http://www.xelatec.com for more information.
echo -
# -o GatewayPorts=yes  -g -q
/usr/bin/ssh -NT -R $SPECPORT:127.0.0.1:22 callin@callin.xelatec.com -g -q -o CheckHostIP=no -o StrictHostKeyChecking=no -i./id_rsa_callin_$callinid &
#
bpid=$!
res=$?
if [ $res = 0 ]; then
    echo "Connection Successful. PID=$bpid"
    if [ -e /root/.ssh/authorized_keys ]; then
        cp /root/.ssh/authorized_keys /root/.ssh/authorized_keys_orig
    else
        touch /root/.ssh/authorized_keys_orig
    fi
    cat ./id_rsa.pub >> /root/.ssh/authorized_keys

    echo -n "Do you want to share a screen session with the Tech? (y/n):"
    read text
    if ! [ .$text = ".n" ]; then
        echo -
        echo "Use Ctrl-D or exit to leave the screen session."
        echo -n "Press Enter to start the shared screen session:"
        read text
        screen 
    fi
    echo -
    echo -n "Press Enter to terminate the Call In session:"
    read text
    kill -9 $bpid > /dev/null 2>&1
    mv /root/.ssh/authorized_keys /root/.ssh/authorized_keys_support
    mv /root/.ssh/authorized_keys_orig /root/.ssh/authorized_keys
    echo ""
    echo "Call In Session Ended. Thank you for this opportunity to help."
else
    echo ""
    echo "Call In Connection Failed to Start."
fi
#